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COMMITMENTS AND CONTINGENT LIABILITIES, LEGAL PROCEEDINGS (Details) - USD ($) $ in Thousands	1 Months Ended			12 Months Ended
	Sep. 30, 2014	Jul. 31, 2013	Feb. 28, 2012	Sep. 30, 2015
Site Contingency [Line Items]
Recovery period				7 years
Site contingency, recovery from third party of environmental remediation cost			$ 20,000
Regulatory assets	$ 377,575			$ 410,155
Minimum [Member]
Site Contingency [Line Items]
Litigation settlement, gross				150,900
Maximum [Member]
Site Contingency [Line Items]
Litigation settlement, gross				242,100
Enviromental remediation costs expended, net of recoveries [Member]
Site Contingency [Line Items]
Regulatory assets	30,916			18,886
Environmental Restoration Costs, Liability for Future Expenditures [Member]
Site Contingency [Line Items]
Regulatory assets	177,000			$ 180,400
July 2013 SBC Filing [Member] | SBC [Member]
Site Contingency [Line Items]
Approved rate, amount		$ 18,700
September 2014 SBC Filing [Member] | SBC [Member]
Site Contingency [Line Items]
Requested rate, amount	$ 8,500

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